It is highly likely you are seeing a duplicate of:
6413510 zfs: writing to ZFS filesystem slows down fsync() on
other files in the same FS
which was fixed recently in build 48 on Nevada.
The symptoms are very similar. That is a fsync from the vi would, prior
to the bug being fixed, have
One more piece of information. I was able to ascertain the slowdown happens
only when ZFS is used heavily; meaning lots of inflight I/O. This morning when
the system was quiet my writes to the /u099 filesystem was excellent and it has
gone south like I reported earlier.
I am currently
Here's the information you requested.
Script started on Tue Sep 12 16:46:46 2006
# uname -a
SunOS umt1a-bio-srv2 5.10 Generic_118833-18 sun4u sparc SUNW,Netra-T12
# prtdiag
System Configuration: Sun Microsystems sun4u Sun Fire E2900
System clock frequency: 150 MHZ
Memory size: 96GB
